Environmental Factors: The main mechanisms by which
environmental compounds increase breast cancer risk are
acting like hormones, especially estrogen, or affecting
susceptibility to carcinogenesis.11 The evidence generally
supports an association between breast cancer and polycyclic
aromatic hydrocarbons (PAHs) and polychlorinated
biphenyls (PCBs) dioxins and organic solvents. On the other
hand evidence is still based on a relatively small number of
studies.